Путеводитель по Руководству Linux
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   sar    ( 1 )

собирать, сообщать или сохранять информацию о деятельности системы (Collect, report, or save system activity information.)
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Ошибки (баги) (Bugs)

/proc filesystem must be mounted for the sar command to work.

All the statistics are not necessarily available, depending on the kernel version used. sar assumes that you are using at least a 2.6 kernel.

Although sar speaks of kilobytes (kB), megabytes (MB)..., it actually uses kibibytes (kiB), mebibytes (MiB)... A kibibyte is equal to 1024 bytes, and a mebibyte is equal to 1024 kibibytes.